From: Anders Blomdell <anders.blomdell@domain.hid>
To: xenomai@xenomai.org
Subject: [Xenomai-core] [PATCH] Slow is faster arch/ppc/syslib/open_pic.c
Date: Tue, 07 Feb 2006 17:04:51 +0100 [thread overview]
Message-ID: <43E8C523.2030107@domain.hid> (raw)
In-Reply-To: <43E73441.9090702@domain.hid>
When trying to run Xenomai on PowerPC with OpenPIC, I have (finally) found that
interrupt latency is much improved with the following patch:
--- arch/ppc/syslib/open_pic.c~ 2006-01-08 03:15:24.000000000 +0100
+++ arch/ppc/syslib/open_pic.c 2006-02-07 16:56:14.000000000 +0100
@@ -820,7 +820,7 @@
*/
static void openpic_ack_irq(unsigned int irq_nr)
{
-#ifdef __SLOW_VERSION__
+#if defined(__SLOW_VERSION__) || defined(CONFIG_IPIPE)
openpic_disable_irq(irq_nr);
openpic_eoi();
#else
@@ -831,7 +831,7 @@
static void openpic_end_irq(unsigned int irq_nr)
{
-#ifdef __SLOW_VERSION__
+#if defined(__SLOW_VERSION__) || defined(CONFIG_IPIPE)
if (!(irq_desc[irq_nr].status & (IRQ_DISABLED|IRQ_INPROGRESS))
&& irq_desc[irq_nr].action)
openpic_enable_irq(irq_nr);
The reason for this, is that the fast version doesn't call openpic_eoi until the
interrupt is ended, which means that all RT-interrupts are delayed by a pending
Linux interrupt.
--
Regards
Anders Blomdell
next prev parent reply other threads:[~2006-02-07 16:04 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-31 18:53 [Xenomai-core] [PATCH] Shared irqs v.6 Dmitry Adamushko
2006-01-31 19:09 ` Jan Kiszka
2006-01-31 19:50 ` Dmitry Adamushko
2006-01-31 20:14 ` Jan Kiszka
2006-02-01 8:32 ` Jeroen Van den Keybus
2006-02-01 8:46 ` Jan Kiszka
2006-01-31 19:40 ` Jan Kiszka
2006-02-01 13:59 ` [Xenomai-core] Are XN_ISR_CHAINED and XN_ISR_ENABLE mutually exclusive? Anders Blomdell
2006-02-01 14:52 ` Jan Kiszka
2006-02-01 15:00 ` Anders Blomdell
2006-02-01 15:26 ` Anders Blomdell
2006-02-06 11:34 ` [Xenomai-core] [BUG] problems with adeos-ipipe-2.6.14-ppc-1.2-00.patch Anders Blomdell
2006-02-06 18:44 ` Philippe Gerum
2006-02-07 16:04 ` Anders Blomdell [this message]
2006-02-07 16:16 ` [Xenomai-core] [PATCH] Slow is faster arch/ppc/syslib/open_pic.c Philippe Gerum
2006-02-08 9:40 ` Philippe Gerum
2006-02-08 17:57 ` Philippe Gerum
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